Staff Selection Commission Quantitative Aptitude — Question 356

Question

The average of 6 numbers is 30. If one number is excluded, average becomes 28. What is excluded number?

1. 38
2. 40
3. 42
4. 45

Correct answer

B — 40

Explanation (English)

Sum of 6 = 30 × 6 = 180. Sum of 5 = 28 × 5 = 140. Excluded = 180 - 140 = 40

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